[gjs/wip/gobj-kitchen-sink: 12/21] GParamSpec: set an exception when invoking the constructor with wrong arguments

[Jasper St. Pierre <jstpierre src gnome org>]

commit 74c413a6f766d22d9ef5a5c9c82217357e48fa51
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Fri Dec 9 19:12:23 2011 +0100

    GParamSpec: set an exception when invoking the constructor with wrong arguments
    
    Returning FALSE without an exception will confuse the JS API. Instead,
    we should report the wrong arguments to the user.

 gi/param.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/gi/param.c b/gi/param.c
index fd61665..36aa3b6 100644
--- a/gi/param.c
+++ b/gi/param.c
@@ -186,15 +186,21 @@ param_new_internal(JSContext *cx,
     gchar *blurb;
     GParamFlags flags;
 
-    if (argc < 5)
+    if (argc < 5) {
+        gjs_throw(cx, "Wrong number of arguments to GObject.ParamSpec._new_internal (expected 5)");
         return JS_FALSE;
+    }
 
     if (!JSVAL_IS_STRING(argv[0]) ||
         !JSVAL_IS_OBJECT(argv[1]) ||
         !JSVAL_IS_STRING(argv[2]) ||
         !JSVAL_IS_STRING(argv[3]) ||
-        !JSVAL_IS_INT(argv[4]))
+        !JSVAL_IS_INT(argv[4])) {
+        gjs_throw(cx, "Wrong type of arguments to GObject.ParamSpec._new_internal (expected string, GType object, string, string, number), "
+                  "were %s, %s, %s, %s, %s", JS_GetTypeName(cx, JS_TypeOfValue(cx, argv[0])), JS_GetTypeName(cx, JS_TypeOfValue(cx, argv[1])),
+                  JS_GetTypeName(cx, JS_TypeOfValue(cx, argv[2])), JS_GetTypeName(cx, JS_TypeOfValue(cx, argv[3])), JS_GetTypeName(cx, JS_TypeOfValue(cx, argv[4])));
         return JS_FALSE;
+    }
 
     prop_name = gjs_string_get_ascii(cx, argv[0]);
     prop_gtype = gjs_gtype_get_actual_gtype(cx, JSVAL_TO_OBJECT(argv[1]));